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<p>Supplementary roughage during the dry season in forage-based systems mitigates the adverse effects of lower pasture availability and nutritional quality in forage-based milk production. This study evaluated the effects of soybean hulls as supplementary roughage on milk production, composition, and nitrogen utilization in lactating dairy cows in tropical forage-based systems during the dry season and verify the possibility of fully replacing silage with soybean hulls. Twelve multiparous Holstein-Zebu crossbred cows (453 ± 4.97&#xa0;kg) in mid-lactation were used in a 4 × 4 Latin Square design. The cows grazed <i>Urochloa brizantha</i> cv. Marandu pasture with a continuous stocking rate and were subjected to four supplementation strategies: supplementation only with concentrate (Control); concentrate plus soybean hulls replacing 35% of forage intake (Soybean Hulls); concentrate plus corn silage replacing 50% of forage intake (Corn Silage); and concentrate plus sorghum silage replacing 50% of forage intake (Sorghum Silage). Soybean hulls and corn silage were the most consumed supplementary roughages (<i>P</i> = 0.012). Soybean hulls enhanced daily intakes of ether extract (EE) and neutral detergent fiber (NDF) (<i>P</i> &lt; 0.05). Milk production increased with soybean hull supplementation (<i>P</i> &lt; 0.001), however, did not differ to corn silage when corrected for 3.5% fat content. Milk fat and protein did not differ among treatments (<i>P</i> &gt; 0.05), but lactose and total solids were higher in the soybean hull and control groups (<i>P</i> &lt; 0.05). Soybean hull supplementation reduced milk urea nitrogen (MUN) compared to corn silage (<i>P</i> = 0.022). Overall, soybean hulls improved feed intake, milk production, and nitrogen utilization in dairy cows, supporting their use as a viable alternative to silage in forage-based tropical systems.</p>

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Substitution of silage by soybean hulls in tropical forage-based dairy cow production system during the dry season

  • 期刊论文

  • 发表日期：

    2025年5月8日

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  • Jéssica Coutinho Mezzomo da Silva,
  • Carlos Eduardo Avelino Cabral,
  • Isis Scatolin de Oliveira,
  • Alexandre Lima de Souza,
  • Camila Fernandes Domingues Duarte,
  • Rodrigo Schaurich Mativi Righi,
  • Eduarda Caroline Kichel Cuff,
  • Lucas Gimenes Mota,
  • Carla Heloisa Avelino Cabral

摘要

Supplementary roughage during the dry season in forage-based systems mitigates the adverse effects of lower pasture availability and nutritional quality in forage-based milk production. This study evaluated the effects of soybean hulls as supplementary roughage on milk production, composition, and nitrogen utilization in lactating dairy cows in tropical forage-based systems during the dry season and verify the possibility of fully replacing silage with soybean hulls. Twelve multiparous Holstein-Zebu crossbred cows (453 ± 4.97 kg) in mid-lactation were used in a 4 × 4 Latin Square design. The cows grazed Urochloa brizantha cv. Marandu pasture with a continuous stocking rate and were subjected to four supplementation strategies: supplementation only with concentrate (Control); concentrate plus soybean hulls replacing 35% of forage intake (Soybean Hulls); concentrate plus corn silage replacing 50% of forage intake (Corn Silage); and concentrate plus sorghum silage replacing 50% of forage intake (Sorghum Silage). Soybean hulls and corn silage were the most consumed supplementary roughages (P = 0.012). Soybean hulls enhanced daily intakes of ether extract (EE) and neutral detergent fiber (NDF) (P < 0.05). Milk production increased with soybean hull supplementation (P < 0.001), however, did not differ to corn silage when corrected for 3.5% fat content. Milk fat and protein did not differ among treatments (P > 0.05), but lactose and total solids were higher in the soybean hull and control groups (P < 0.05). Soybean hull supplementation reduced milk urea nitrogen (MUN) compared to corn silage (P = 0.022). Overall, soybean hulls improved feed intake, milk production, and nitrogen utilization in dairy cows, supporting their use as a viable alternative to silage in forage-based tropical systems.